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APIs · head to head

Temenos Transact vs Thunder Client

Temenos Transact logo

Temenos Transact

APIs

Established core banking system used by banks in over a hundred countries

From
On request
Rated
-
Full reviewWebsite
Thunder Client logo

Thunder Client

APIs

Lightweight REST API client built as VSCode extension

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Thunder Client has a free tier, so it costs nothing to try first.
  • Each has a real cost: Temenos Transact the codebase originates in the 1990s, so banks on older releases face major upgrade programmes to reach current versions, and many defer them for years.; Thunder Client paid plans are billed annually only: Starter is $3 per user per month and capped at a maximum of 10 seats, Business is $7 per user per month with 500 monthly collection runs per user, and Enterprise is $16 per user per month for unlimited runs
  • They diverge on capability: Temenos Transact covers Country model banks, Thunder Client covers REST Client.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Temenos Transact and Thunder Client actually diverge.

Attributes where Temenos Transact and Thunder Client differ
AttributeTemenos TransactThunder Client
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWeb, Linux, Windows, REST APIVSCode extension, Web
FoundedUnknown2021

Identical on both: user rating (Not yet rated), category (APIs).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Temenos Transact

  • Country model banks
  • Multi-product core
  • Payments processing
  • API layer
  • Cloud deployment
  • Accounting engine

Only in Thunder Client

  • REST Client
  • Environment variables
  • Response testing
  • VSCode
  • GitHub
  • Webhook support
  • VSCode extension support
  • Web support

What people use each for

The jobs each tool is most often brought in to do.

Temenos Transact

  • A bank in an emerging market needing local regulatory compliance without building it from scratchnot Thunder Client
  • An institution running Islamic banking products alongside conventional ones on one corenot Thunder Client
  • A bank that needs a large pool of experienced implementation consultants to de-risk a migrationnot Thunder Client
  • A group standardising subsidiaries in several countries onto one core banking systemnot Thunder Client

Thunder Client

  • API Developmentnot Temenos Transact
  • API Gatewaynot Temenos Transact
  • API Testingnot Temenos Transact
  • API Documentationnot Temenos Transact
  • Microservicesnot Temenos Transact

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Temenos Transact

  • The codebase originates in the 1990s, so banks on older releases face major upgrade programmes to reach current versions, and many defer them for years.
  • Total cost is dominated by implementation partner fees rather than licence, and those programmes routinely overrun their original estimates.
  • Product changes that cloud-native cores treat as configuration can require development work and a release cycle, which slows time to market for new products.
  • Heavy customisation is common and it makes every subsequent upgrade harder, creating a compounding cost that banks feel a decade after go-live.
  • Temenos has repeatedly restructured its product line and naming, so buyers must check carefully which components a proposal actually includes and which are separately licensed.

Thunder Client

  • Paid plans are billed annually only: Starter is $3 per user per month and capped at a maximum of 10 seats, Business is $7 per user per month with 500 monthly collection runs per user, and Enterprise is $16 per user per month for unlimited runs

Pricing, plan by plan

Temenos Transact

On request
  • Temenos Transact$undefined/year
    • Perpetual or subscription licence scaled by assets, accounts or users
    • Annual maintenance typically a percentage of licence value
    • Implementation delivered by partners and charged separately

Thunder Client

Free
  • FreeFree
    • REST client
    • Collection management
    • Local testing
  • Pro$8/monthly
    • Cloud sync
    • Team collaboration
    • Advanced features

Which should you pick?

Choose Temenos Transact if

  • You need country model banks.
  • You work on Web, Linux, Windows, REST API.
  • You also want multi-product core.
Temenos Transact review

Choose Thunder Client if

  • You need rest client.
  • You want to start without paying.
  • You work on VSCode extension, Web.
  • You also want environment variables.
Thunder Client review

Questions people ask

Is Temenos Transact or Thunder Client better?
Neither clearly leads. Temenos Transact starts at On request and Thunder Client at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Temenos Transact or Thunder Client?
Thunder Client has a free tier; the other does not. Paid plans start at On request for Temenos Transact and Free for Thunder Client.
Does Temenos Transact or Thunder Client run on more platforms?
Temenos Transact runs on Web, Linux, Windows, REST API. Thunder Client runs on VSCode extension, Web.
Can I use Thunder Client for free?
Yes. Thunder Client has a free tier, so you can try it without paying. Temenos Transact starts at On request.
What is Temenos Transact best used for?
Temenos Transact is most often used for a bank in an emerging market needing local regulatory compliance without building it from scratch, an institution running islamic banking products alongside conventional ones on one core, a bank that needs a large pool of experienced implementation consultants to de-risk a migration, a group standardising subsidiaries in several countries onto one core banking system. Of those, a bank in an emerging market needing local regulatory compliance without building it from scratch and an institution running islamic banking products alongside conventional ones on one core are not what Thunder Client is typically brought in for.
What can Temenos Transact do that Thunder Client cannot?
Temenos Transact covers Country model banks, Multi-product core, Payments processing, API layer. Thunder Client covers REST Client, Environment variables, Response testing, VSCode.

Answered from the vendors’ own pages

Temenos Transact: Is Transact the same as T24?

Yes. T24 was renamed Temenos Transact; older installations and much of the consultant population still use the T24 name.

Thunder Client: How much does Thunder Client cost?

Thunder Client publishes a free plan at no cost, then Starter at $3, Business at $7 and Enterprise at $16, all priced annually.

Source
Temenos Transact: Can it run in the cloud?

Yes, it is offered on public cloud, though many existing installations remain on-premises and moving them is a project.

Thunder Client: Is Thunder Client free?

Yes, there is a free plan. It is used through the Thunder Client extension for VS Code, available from the marketplace, with limits applied compared with the paid tiers.

Source
Temenos Transact: What drives the cost?

Licence scaled by size, annual maintenance as a percentage of licence, and implementation partner fees that usually exceed the software cost.

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